Corrosive Ammo: time to rust?

jumping in a bit late but I'd agree it depends on relative humidity. Summer / spring in Alberta I'd say you're good for 6 hours minimum before any real problem. On an SKS I've found rust starts in the gas tube or the piston first, barrels being different steel. I carry a bottle of Windex in my truck, if I'm going to be somewhere I can't clean properly I give the gun a few shots of that and even without a patch they seem good for a day or so. But yes, clean within a reasonable time.
 
Just after shooting corrosive in my SKSs and Mosins I spray liberally inside out with Ballistol. Then I can do a thorough cleaning even a week after and never noticed any rust. The SKS barrel is chromed (for those 1951-58) so the likelihood of corrosion is minimal, anyway. The Mosins are a bit more problematic. Their barrels (rifling) are more prone to catching surface corrosion during longer storage even after a very thorough cleaning. Every month or so I clean the barrel rifling in my Mosins with Ballistol.

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